Here are a few promotional images featuring Scarlett Johansson as the Black Widow in the upcoming "Avengers" movie.
Scarlett Johansson One Sheet for "The Avengers" - The Agent
Scarlett Johansson wallpaper for "The Avengers"
Scarlett Johansson One Sheet for "The Avengers" - Captain America in the background
Non-english One Sheet for "The Avengers" featuring Scarlett Johansson as the Black Widow (I don't recognize the language)